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const std = @import("std");
const builtin = @import("builtin");
const expect = std.testing.expect;
test "try on error union" {
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
try tryOnErrorUnionImpl();
try comptime tryOnErrorUnionImpl();
}
fn tryOnErrorUnionImpl() !void {
const x = if (returnsTen()) |val| val + 1 else |err| switch (err) {
error.ItBroke, error.NoMem => 1,
error.CrappedOut => @as(i32, 2),
else => unreachable,
};
try expect(x == 11);
}
fn returnsTen() anyerror!i32 {
return 10;
}
test "try without vars" {
const result1 = if (failIfTrue(true)) 1 else |_| @as(i32, 2);
try expect(result1 == 2);
const result2 = if (failIfTrue(false)) 1 else |_| @as(i32, 2);
try expect(result2 == 1);
}
fn failIfTrue(ok: bool) anyerror!void {
if (ok) {
return error.ItBroke;
} else {
return;
}
}
test "try then not executed with assignment" {
if (failIfTrue(true)) {
unreachable;
} else |err| {
try expect(err == error.ItBroke);
}
}
test "`try`ing an if/else expression" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
const S = struct {
fn getError() !void {
return error.Test;
}
fn getError2() !void {
var a: u8 = 'c';
_ = &a;
try if (a == 'a') getError() else if (a == 'b') getError() else getError();
}
};
try std.testing.expectError(error.Test, S.getError2());
}
test "'return try' of empty error set in function returning non-error" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
const S = struct {
fn succeed0() error{}!u32 {
return 123;
}
fn succeed1() !u32 {
return 456;
}
fn tryNoError0() u32 {
return try succeed0();
}
fn tryNoError1() u32 {
return try succeed1();
}
fn tryNoError2() u32 {
const e: error{}!u32 = 789;
return try e;
}
fn doTheTest() !void {
const res0 = tryNoError0();
const res1 = tryNoError1();
const res2 = tryNoError2();
try expect(res0 == 123);
try expect(res1 == 456);
try expect(res2 == 789);
}
};
try S.doTheTest();
try comptime S.doTheTest();
}
test "'return try' through conditional" {
const S = struct {
fn get(t: bool) !u32 {
return try if (t) inner() else error.TestFailed;
}
fn inner() !u16 {
return 123;
}
};
{
const result = try S.get(true);
try expect(result == 123);
}
{
const result = try comptime S.get(true);
comptime std.debug.assert(result == 123);
}
}
test "try ptr propagation const" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
const S = struct {
fn foo0() !u32 {
return 0;
}
fn foo1() error{Bad}!u32 {
return 1;
}
fn foo2() anyerror!u32 {
return 2;
}
fn doTheTest() !void {
const res0: *const u32 = &(try foo0());
const res1: *const u32 = &(try foo1());
const res2: *const u32 = &(try foo2());
try expect(res0.* == 0);
try expect(res1.* == 1);
try expect(res2.* == 2);
}
};
try S.doTheTest();
try comptime S.doTheTest();
}
test "try ptr propagation mutate" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
const S = struct {
fn foo0() !u32 {
return 0;
}
fn foo1() error{Bad}!u32 {
return 1;
}
fn foo2() anyerror!u32 {
return 2;
}
fn doTheTest() !void {
var f0 = foo0();
var f1 = foo1();
var f2 = foo2();
const res0: *u32 = &(try f0);
const res1: *u32 = &(try f1);
const res2: *u32 = &(try f2);
res0.* += 1;
res1.* += 1;
res2.* += 1;
try expect(f0 catch unreachable == 1);
try expect(f1 catch unreachable == 2);
try expect(f2 catch unreachable == 3);
try expect(res0.* == 1);
try expect(res1.* == 2);
try expect(res2.* == 3);
}
};
try S.doTheTest();
try comptime S.doTheTest();
}
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